Transmission Control System Mil Request [Solved]

The P0700 OBD2 code is a relatively generic code and one that you should take seriously. It indicates a malfunction in the transmission control system. It preventing your car from changing gears properly, making you a hazard to yourself and others on the road. Fixes for the P0700 code may be specific to your vehicle’s make and model. Take this into account as you’re going through your diagnosis. Follow any advice outlined in your manual over the general diagnosis steps. You can also follow the below steps followed from the manual to know the transmission control system mil request.

The P0700 code solutions range from simply replacing your transmission fluid to an entire overhaul of your transmission system. The good news is, an OBD2 scan tool gives you all the data you need to diagnose this trouble code.

What Does P0700 Mean?

Many cars have a control module for automatic transmission called the transmission control module (TCM). The TCM monitors the sensors and actuators relating to transmission control and communicates with the Engine Control Module (ECM) to inform it of any possible issues with the automatic transmission control module. The trouble code P0700 is set whenever the TCM detects a malfunction with the transmission controls.

What Causes P0700?

It is often seen with shift solenoid issues or other transmission codes. The most likely reason the code appears is that the transmission control module detects a problem in the transmission.

  • A faulty transmission control system
  • Shorts in the wiring

  • Transmission issues
  • Defective shift solenoids

  • Defective engine coolant sensor
  • Dirty transmission fluid or low levels

Can I Drive My Car With A P0700 Code?

P0700 code is one of the very serious codes that you never want to drive your vehicle when dealing with it. Even if your car drives just fine, you can introduce major damages to the transition. As automotive experts suggest, in case either you notice that it’s hard to switch gears or one of the gears is stuck into one position, you must stop driving your vehicle as soon as possible.

Error P0700 code might be linked to major unclear damages to the transmission. Thus, not only will it cause safety hazards to yourself but also the people around you on the road.

Tools Needed To Diagnose

  • OBDII Tool
  • Vehicle Scan Tool
  • Vehicles owner manual

How To Fix The Transmission Control System Mil Request?

We will provide you with a summary of how you can try to fix a transmission control system mil request. The intent here is to eliminate labor costs as much as possible. However, if none of the below worked to eliminate the P0700 code, you must take your vehicle to the nearest repair shop and have a professional mechanic perform certain manufacturer tests to detect the route issue causing the problem.

1. Use An OBDII Tool

The first step to solve any error code displayed in the form of a check engine light is to first confirm that there exists. To do so, you can use an OBDII tool and connected it to the vehicle’s computer. The tool will immediately display any active errors, and it will also show you previous errors that you’ve resolved before.

Once you see a P0700 code on the screen, you can go ahead and test the following problem of transmission control system mil request to see if you can fix this error or not.

2. Inspect The Transmission Control System

The only known way to eliminate our P0700 code is to inspect and fix the transmission control system. You will find this module usually in the back of the transmission. However, in case you had a hard time locating it, you can always refer to your vehicle’s owner’s manual. It provides you with detailed guidance on where to find it.

Perform a quick visual inspection to see any signs of damages to the transmission control system and its electrical connections. Once detecting a damaged sign, you can go ahead and replace the transmission control module.

Before replacing you should make sure that you compare the new part to the old one or refer to your vehicle’s owner’s manual to get an exact number to avoid purchasing the wrong part.

3. Clear The Error

After replacing the transmission control system, you need to reconnect the OBDII again to the vehicle’s computer and remove any inactive errors. Once you do so, the P0700 error code will go away. It is also suggested that you perform a second scan to check whether you resolved the issue completely or not.

In case this method we mentioned earlier did not resolve your issue. You need to take your vehicle to the nearest repair shop so you can have a mechanic inspected to determine the real culprit causing the problem.

Estimated Cost of Repair Transmission Control System

For error code P0700, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to repair. In case you have an issue with the valve body it may cost between 320$ to 900$. If you have an issue with the transmission, it may cost between 1800$ to 4500$. In case you have a problem with the transmission control system, the cost will vary between 840$ to 900$

Common Mistakes To Avoid While Diagnosing The P0700 Code

The biggest mistake is to diagnose based on your car’s symptoms rather than reading the trouble codes. The drivability issues associated with P0700 can be misinterpreted as engine misfires. With a serious code like this, it’s crucial to conduct a thorough diagnosis using an OBD2 scan tool and ensure you’ve fixed the issue.


Proper maintenance of your transmission system is the best way to avoid the P0700 code. Check your transmission fluid regularly and replace it when it gets dirty. If you see drips or puddles of transmission fluid in your garage or driveway, locate and fix the leak right away, even if no trouble codes are active.

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